A 34-year-old male presents to your office complaining of pain on the inside of his right elbow for the past month. He is an avid golfer and has noticed the pain worsening after playing golf on weekends. On physical examination, you notice tenderness over the medial epicondyle and discomfort during resisted wrist flexion. Which of the following diagnostic tests is most likely to confirm medial epicondylitis (golfer’s elbow)?